If you are wondering what type of clothes to bring...
Eastern Colorado is semi arid. The humidity frequently gets below 10%. This results in big temperature swings. Satirday it went from 38 to 78. Yesterday from 41 to 83. The best thing is to have layers. Start out with several, peel them off during the day and start putting them back on in the early afternoon. Golden is right up against the foothills, so everything will be in shade by about 4 PM. The low humidity means that it is very cool in the shade.
It seldom rains all day. If your top layer is water repellant, you should be OK.